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P2 Length in Centimetres and Metres: Paper 4 Error Drills
P2 Length in Centimetres and Metres: Paper 4 Error Drills
This paper targets the commonest P2 length slips: treating the metre-centimetre step as 10, adding mixed units before converting, counting the leftover as a full piece, and forgetting to double when finding a perimeter. Ten graded items, each with an answer and a one-line note.
Direct answers Items 01 to 03 redo basic metre-centimetre conversions, 04 to 06 handle addition and subtraction of mixed units, 07 to 09 cover cutting into pieces, a rectangle perimeter and step length, and 10 corrects writing 1 metre 5 centimetres as 15 centimetres.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 25 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: P2 Length in Centimetres and Metres |
| Level | P2 |
02 Questions (10 items)
- FoundationHow many centimetres are there in 5 metres?
- FoundationWrite 320 centimetres in metres and centimetres.
- FoundationHow many centimetres is 2 metres 7 centimetres?
- IntermediateOne rope is 1 metre 45 centimetres and another is 85 centimetres long. Find the total length.
- IntermediateA cloth strip is 6 metres long and 2 metres 40 centimetres is cut off. How much is left?
- IntermediateThree ribbons are 1 metre 20 centimetres, 95 centimetres and 1 metre 8 centimetres long. Find the total.
- ChallengeA 5-metre cloth is cut into 40-centimetre pieces. Find the number of pieces and the length left over.
- ChallengeA rectangular classroom is 8 metres long and 6 metres 50 centimetres wide. Find the distance right round it.
- ChallengeEach step is 45 centimetres long. How far does Xiaoming walk in 8 steps? Give the answer in metres and centimetres.
- Error redoA student writes 1 metre 5 centimetres as 15 centimetres, saying 1 and 5 make 15. What is wrong, and what is correct?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 500 centimetres. | One metre is 100 centimetres, so five metres is 5 times 100, not 5 times 10. |
| 2 | 3 metres 20 centimetres. | Every 100 centimetres makes one metre, leaving 20 centimetres over. |
| 3 | 207 centimetres. | Change 2 metres to 200 centimetres then add 7; 27 would drop the factor of 100. |
| 4 | 2 metres 30 centimetres, which is 230 centimetres. | Work in centimetres: 145 + 85 = 230, then trade every 100 centimetres for a metre. |
| 5 | 3 metres 60 centimetres. | 6 metres is 600 centimetres, and 600 minus 240 leaves 360 centimetres. |
| 6 | 3 metres 23 centimetres. | Convert all to centimetres first: 120 + 95 + 108 = 323. |
| 7 | 12 pieces with 20 centimetres left over. | 500 divided by 40 is 12 remainder 20; the leftover is too short for another piece. |
| 8 | 29 metres. | Length plus width is 14.5 metres, and the perimeter doubles that to 29 metres. |
| 9 | 360 centimetres, which is 3 metres 60 centimetres. | 45 times 8 is 360 centimetres, and dividing by 100 gives 3 metres 60 centimetres. |
| 10 | It should be 105 centimetres: 1 metre is 100 centimetres, plus 5. | The step between metres and centimetres is 100, not 10, so multiply the metres by 100 before adding. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
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